prl_vm_app takes more than 2 GB

Good morning everyone:
On my mac Activity monitor I can see the inactive take a lot of memory gradually (within minutes) until it reaches 7 GB (I have 16GB of RAM) until the machine becomes too slow.
Any suggestion why this happens please?
BTW, I use the command purge to solve the problem temporarily, but this does does not solve the problem permanently. it comes back within minutes.

While a large chunk of inactive memory may be coinciding with the machine slowing down - inactive memory would not be the issue causing the machine to slow down - inactive memory is memory that has been used, but is not being used currently - it is available at request for anything else that needs it.

I'd be looking at CPU usage instead and what application is being used.

I cannot be held responsible for the things that come out of my mouth.
In the Windows world, most everything folks don't understand is called a virus.